Now, I want to upgrade my Mac SSD. Fix Windows has.Recently, I installed macOS 10.15 Catalina on my MacBook. However, when you run CHKDSK for SD card, external hard drive partition, etc. From what I’ve read and from prior experience with older versions of MacOS, it should work, but you should be aware of a few things:For more information, see Disk cleanup in Windows 10. If you have multple Macs to upgrade, it’s a lot more efficient to plug in the USB installer drive and run the installer than to log into the App Store, download the 8.09GB OS installer, and then run it.I haven’t actually done this before, so others please feel free to correct/update me. Install Mac Os To External Drive An external drive that you can use as an installer for macOS Catalina is a handy thing to have.I have a Mac mini (2014) model and yesterday I bought a Samsung T5 meaning to install Catalina on it and run macOS over USB. (If your Mac comes with an SSD, TRIM will already be enabled.) (If your Mac comes with. Even better (but maybe too expensive) a Thunderbolt device.By default, Mac OS, unlike Windows, doesn't automatically enable the TRIM command for a self-installed SSD. Better, a USB 3.1-gen-2 (10 Gbit/s) device. At minimum, use a USB 3.0 device. When you search ‘clone macOS Catalina hard drive’ via Google, you may get thousands of results - most of them are useless or very complicated.Make sure you have enough bandwidth for the SSD.
On An External Ssd Download The 8If it doesn’t, you need to reformat the external disk before you can install macOS on it. On the right, check if the description below the disk name mentions GUID Partition Map. Disks appear flush left in the list (volumes are indented below disks). After a reboot I can't get it to boot from the SSD.Select the external disk in the list on the left. Everything worked, had all my files and applications. SATA tops out at 6 Gbit/s, so just use a USB3 enclosure. If you are building an external SSD from a SATA-based device, then Thunderbolt is overkill. Let the SSD have all of the port’s bandwidth. After agreeing to the software license agreement, it asks where you want to install it. Just download the installer app from the App Store.According to this MacWorld UK article, you should be able to tell the installer to use your external disk: Download, but do not run the Big Sur installer via the App Store. (If you format it as “Mac OS Extended”, the Big Sur installer will convert it as a part of the installation process). Especially if you think you may end up repeating the installation (perhaps to install onto multiple computers). After installation, before rebooting, use the Startup Disk settings page to select your SSD as the new boot device.Alternatively, you may prefer to make a bootable USB thumb drive and use its installer. Then continue with the installation. As I wrote, I have not actually done this before, so you might want to wait and see if anyone else replies with any corrections, in case I didn’t get it right.CarbonCopyCloner will let you make (sort of) bootable Big Sur clones…but you need to read the documentation on how to do it. Install/migrate your apps and data as you would if it was a new Mac.Good luck. Then use the Startup Disk system setting to make that device the default.In either case, you will have a clean installation on your external SSD. When the Mac restarts (post-installation), hold down Option in order to select your new installation (on the SSD) in order to start from it. It should let you select where you want to install it (click “show all disks” if your SSD is not visible) - select your SSD and continue with the installation. From there, you can use Disk Utility to format your external SSD, if you haven’t already done so (use GUID partition map and APFS format) and then run the Big Sur installer. Download the Big Sur installer and install on the external then use Migration Assistant to move everything over. If it’s only TB2 then while it will be likely better than the internal spinning drive it might be as responsive as Glenn’s is.Assuming you get the SSD hooked up…then you have two choices. Since the OS partition is separate and unwrite-able…just installing BS on the clone and then cloning just the non OS partition is essentially the same…the only drawback is that in order to update the OS on the clone drive you’ll need to boot from it and update the OS as I recall from the instructions at CCC.What flavor of Thunderbolt does your 2017 have…you’ll want a TB drive that matches that and not a USB one. I’ve had no problems so far, It’s been 3 days since I made the switch. You can get whatever size NVMe stick you want in a pretty wide range of prices, or buy a “built” one from OWC and just plug and play!In any case, I did a clean install of Big Sur from my recovery drive, and used Migration Assistant to pull over all my accounts and data. I was trying to do this as inexpensively as possible, and still have decent performance. I have a 2017 iMac 27 (18,3 is exact model fwiw) and am running Big Sur 11.3 from an external Thunderbolt SSD 2TB right now no problem.Now my machine had no issues to begin with, and I already was running Big Sur, but I wanted the speed of a SSD without having to replace the internal drive.I bought the OWC Envoy Express Thunderbolt enclosure at OWC ( $79.00 at macsales.com), and added a Mushkin Pilot-E 2 TB NVMe ssd to it from newegg.com (it was on sale for $215.00, but since sold out). Sam smith m4aNot a cheap as but my notes say a 3-year warranty.All that said, I might well buy a new 32-in. Mainly was waiting because I use some open source libraries and wanted to make sure they were fine with Big Sur.External 1.92 TB Solid State PCI-Express DriveOWC Envoy Pro EX 2TB Rugged, Portable Solid-State Drive with Thunderbolt 3. I upgraded to Big Sur at 11.3. A major pain because if you have any iCloud things opening you get endless password protection garbage (I know it’s trying to help, but this is the same machine in my home) and then you have to go through some of the same things when you boot back from the external drive.The Fusion drive is of course there and the only downside is that the Fusion drive files show up on searches because it’s in the state it was whenever I started using the SSD. One thing that I have tried a couple of times is booting from the Fusion drive. With Catalina installed it wasn’t all that different from the Fusion drive, but the fast SSD is much better.Installation seemed just the same as for an internal drive.
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